Summary Produce gas with different chemical reactions. Science content Chemistry: States of Matter, Properties of Materials (K-7) Chemistry: Physical Changes, Solutions, Mixtures and Separating (2, 4, 5, 6) Chemistry: Chemical Changes (2, 7) Activities in this lesson Baking soda and vinegar Mini baking soda rocket (film canister) Elephant's toothpaste Coke and mentos Procedure Explore some chemistry of making foams (and small explosions). First try acid-base reactions that make gases: 1. Mix vinegar and baking soda to make carbon dioxide gas 2. Add Alka seltza tablets to water Chemical reaction: HCO3 + H -> CO2 + H2O The Alka seltza reaction can be sealed in a film canister, to make the lid blow off as the gas pressure rises. (also see ideas in Chemical reactions with baking soda lesson) Then break down hydrogen peroxide to make gas: 3. Elephant's toothpaste 2H2O2 -> O2 + 2H2O Then make a fountain as gas rapidly comes out of solution. 4. Coke and mentos activity Grades taught Gr K Gr 1 Gr 3 Gr 4 Gr 5
